Mining maohineey



- 12 sheets she'et 2.

(No Model.)

G. P.CARD. MINING MAGHINERY..

No. 598,360.- Patented Feb. 1, 189.8.

12' Sheath-Sheet 3.

Patentd Feb. 1,18%.

GfIHOARD. MINING MACHINERY.

(N 0 Model.) I L E If I .Jm m.

(No Model.) v N 12 sheets she'eus.

. v G I. CARD.

MINING MACHINERY.

No. 598,360. Paitehtedfeb;1,1898.

(No Model.) 12- Sheets--Sh.eet 7.

GTJOARD.

MINING MACHINERY.

Patented, Ieb. 1, 1898.

J m/f? 12 Sheets-Sheet 9.-

. BEARD.

' I GMAOHINERY."

' 1 'PatentdiPeb.1,1898.-

(Np Model.

. 12 Swam -sheet 10. G. F. CARD.

MINING M AGHINERYg u Patented Feb. 1, 1398;;

)(No Model.) r 12 -Sheets-Sheet 11.

' BOARD.

MINING MACHINERY. N 98,360; Patented Feb. 1, 1898.-

I @3 1 abtozmmy n 3.

cnoneu 1- CARD, on oovme'rou, KENTUCKY.

MINING MACHINERY.

l srscxmcn'non forming patter Letters Patent No. 598,360, dated February 1, 1898. Application filed m 27, 1892. Serial 'NO. 441,301. (No man.)

To all, who/11, it lit/1. concur/11:

Be it known that I, GEORGE F. Cam), a citizen of the United States, residingin 00vington, county of Kenton, State of Kentucky, have invented certain new and useful Improvements in Mining Machinery, of which the following is a specification.

The subject of this invention is an improved machine for mining or undercutting coal or other minerals; and the machine is designed more especially for operating on the lo11g-' .vall or continuous-face system, wherein a horizontal cut is made at or near the lower edge of the vein and along the full length of the gallery, but may be advantageously employed in mines condueted'on the more common rooni-and-pillar system.

lhe machine, broadly speaking, consists of a projecting cutting apparatus'driven by a motor of an y preferred type,suitably mounted on a sliding frame moved on a track along the face of the gallery, and knives or cutters fastened to the links of an endless chain, so driven in a horizontal plane that a continuous kerf is out under the mineral near the lower part, whereby the overhanging mass may be more readily detached.

My invention consists in a construction and arrangement of parts whereby the advantages of end-cutting and side-cutting machines are united in a single machine; in thepeculiar construction and adaptation of the parts eonclose of or (luring a cut; in the construction level of theunaehine and the combination therewith of means for stead yin g the machine during its movement along the track; in mechanism for eiamping the frame carrying the operating mechanism to the main frame; in the construction of the cutterdinks and the combination, with them, of detachable shoes and means for securing the two parts and means for connecting two or more see-- tionstogether; in a separate carriage or truck for supporting and guiding the machine on the track across the room or gallery during the operation of cutting; in the combination, with the main frame, of a device for securing the latter to the carriage or truck and means for throwing the main frame to an angle with the track in a manner and for a purposehereinafter more fully described; in means for fastening the feed or drawing chain tothe wall of the gallery.

In the accompanying drawings, Figure 1 is a detailed plan view of the rear portion of my machine, showing the operating mechanism and engine connection therewith, also the main frame and supporting screws with trailing wheel in position. Fig. 2 is a plan view of the remaining portion of the main frame and cutter-arms with a section of the track and the carriage on which the machine is supported while in operation; Fig. 3, a longitudinal vertical section on theline S 3 of Fig. 1, the swinging plate carrying the feeding mechanism being turned at right angles to the position shown in Fig. 1. Fig. 4- is a longitudinal vertical section on the line 4 4. of Fig. 2. 5 5 of Fig. 1. Fig. (3 is aplan view of a section. of track and the carriage. Fig. 7 a longitudinal sectional view of thetracinshowing the ends of two sections brought together. Fig. 8 is a eross-seetionof the track and connecting-piate. Fig. S1 is a side view of the Fig. 5 is a sectional view on line.

. tea er.

' angular position of the main frame relatively tothe track. Fig. 12 is a side view of .the

' Same portion of the main frame, representing the carriage-connecting device in position for the well.

transportation about the mine. Fig. 13 is a side elevation of a broken-oh sectionpf the main frame'with the rearportion turned up. Fig. 14 is a view of a portion of the cutterchain, showing one cutter-link with holder and cutters in position. Fig.'15 is a side elevation of the same with a section of the shoe "or guide-forming part of the cutter-arm. Fig. 16 shows a longitudinal section of a cutterlink and shoe with the pintles for holding the shoe in place and for connecting other links to it. Fig. 17 is a perspectiveview of a single-cutter holder-and cutters. Fig. 18 is a perspective view of the pin used for securing the cutter-holders in the links. Fig. 19 is a plan view of thetraili-ng wheel used for supporting the rear part of the machine during the operation of cutting. Fig. 20 is a side view-of thesamc, showing a-section-ofthe" main frame and broken-01f parts of the ad'- justing-screws. Fig. 21 is a perspective view of the screw-eye used as a fastening for the feed-chain in the rib or pillar of coal. 22 is a vertical section of the same and of the wedge or key used. for clamping the screw in Fig. 23 is a cross-section of the same through line 00 0c of Fig. 21. a diagrammatic plan of a mine room or gallery, showing the machine in position for cutting and the changes at successive stages of the operation; Fig. 25, a conventional view of the feed mechanism with the feed-chain; Fig. 26, a plan view of the essential parts in an organized position; Fig. 27, a partial end view of the machine, and Fig. 28 a plan of the same.

In the drawings, A represents the main frame of the machine, which is made in two sections A and A consisting, respectively,

, of longitudinal bars a and a connected by transverse bars a, X-shaped braces a a trans verse arched bar a at the forward end, and parallel transverse bars a at the rear end. This construction makes a strong and rigid frame and is continued throughout the entire length. The object in constructing the 'main frame in sections is to provide a frame which is long enough to permit the cutter-- driving mechanism to travel longitudinally thereon forthepurpose of end cutting, but which may be shortened to enable the machine to avoid posts or other obstructions when used for side cutting. This is important, since in many mines the roof is insecure and must be supported by frequent posts or pillars for the Fig. 24: is

hole, and through side piece a is an oval hole: a, and taking through both of these'holes is a bolt a having on one end a head adapted to prevent turning and on the other end a clamping-nut a. This construction applies to the parts constitutingboth sides of the frame. In Fig. 13 the section A is shown turned up and supported by'the bolt o which also clamps it and holds it in its position. To bring the sections of the frame into horizontal alinement, the nut a is loosened and the section A brought down, the slot (L13 permit ting it to be drawn backward sufficiently to permit the tongues a and a to clear the walls of the recesses a and a". The sections are then moved together and the nut a tightened, the tongues a and a taking, respectively, into the recesses a and a. This makes a rigid continuous frame of suliicient length for working to the best advantage, but which may easily be shortened when necessary.

, "The bars constituting the sidepfices of the frame are preferably of steel and of the form of rolled steel known as bulb-angle. The bulb is planed square, as shown ato Fig. 5, and forms tracks or guides upon which the operating mechanism may be moved upon the frame longitudinally. The flang es a upon the lower inner side of the frame-pieces afford a convenientpoint of attachment for the transverse bars Ct and braces (0 the ends of which are securely riveted thereto.

B is the motor-frame, carrying a forwardlyextending part 0 and a cutter-arm D. in the sides of the motor-frame are channels I), in which fit the guides a of the main frame. The motor-frame may be moved longitudihally along theseguidesadistance equal to the available length ofthe cutter-arm. Supported in suitable bcarin gs I) in the motor-frame is the motorarmature-shaft 0 carrying pinion Zr", which meshes in a bevel-wheel c. Any preferred type of motor may be used, but I prefer an electric motor of the kind shown in section in Fig. 5, in which 1) represents the armature, b the poles, Z) the side pieces of the frames, and b the field-poles. These poles extend wclldown over the sides of the a suitable rhcostat b is provided for starting purposes. The forwardly projecting part 0 is securedto the motor-frame proper by screws '0 andis provided with a boss 0 which hub of the wheel and bushing which constitute the principal bearing of the "device. The bearing for the upper end of the vertical shaft 0 is provided in a plate or arm 0, ex-

. tending. from the top of the motor-frame 15,

in engagement with those of worm c.

and bored at c te receive the shaft.

The-extension G of the secondary frame is constructed with upwardly-extending front and side pieces 0- and 0 the sides extending back and lapping the motor-frame B asufiicient distance to permit them to be secured thereto and with the cover 0 forming a "chamber inclosing the bevel-pinion b and bevel-wheel c and protecting them from flying particles of coal or dirt.

Near the upper end of vertical shaft 0" is worm c, and immediately below it is a clutch c". The worm is loosely fitted on the shaft and is free to turn in a horizontal plane, but

is prevented from movement longitudinally on the shaft by the bearing for the shaft on the upper end and a shoulder atits lower end on the shaft. The clutch is prevented from turning on the shaft,but has free movement longitudinally up or down the shaft a sufficient distance to release from engagement thcclutch extensions on the opposing ends of the two parts. Around the outside of the body of the clutch near its center is turned a groove or channel 0 in which take the inwardly-pointing and rounded extremities of a pivoted yoke-lever c. Attached to yokelever 0 is a connecting-strap c terminating at its upper extremity with an eye 0", which embraces the hub of an eccentric c This in turn is suitably mounted in bearings on the upper side of extension-plate and is provided with a lever 0 In Fig. 3 the clutch extensions are shown To release them, the lever c is turned forward, and acting through eccentric a, connectingstrap (1 and yoke-lever 0 causes the rounded extremities of the yoke toprcss against the lower side of the channel and by forcing the clutch downward to release its extensions from engagement with those of the worm. A reverse movement of 'the' lever will cause them to reengage and lock the norm against rotation on the shaft.

(1 This wheel or gear is used for driving the cutter-chain, as will bemore fully described hereinafter.

To provide for feeding the secondary frame forward automatically as the cutters perform their operation at the'commencement of a cut and also to feed the machine later ally along the track, I have provided a plate On the lower extrenn. ity of vertical shaft 0 is keyed a sprocketwheel 0 which may be further held by a nut E, on. whichare the bearings for the required shafting and.on which is placed all the necessary gearing for change of speeds. The plate E is placed over the lid or cover 0 of the extension C of'the motor-frame and is bored to take over a hub or boss ciP, encircling vertical shaft 0 This plate,with the n1eclianism which it carries and which I am about to describe, has a capacity for movement about the shaft c5 through. an arc of ninety degrees, or thereabout, and is provided with means for locking it in any desired position relatively to the extension In the form shown plate E is provided with a curved slot 6, through which takes a stem 0 having at its lower end a screw-threaded portion adapted to take. into a corresponding thread in a boss or projection 0 on the forward end of extension-O. This stemhas an annular shoulder 0 adapted to engage with the plate E, and a hand-wheel 0 By rotating the stem 0 until the shoulder e engages platcE the latter may be clamped at any desired point in the arc. By releasing the clamping-screw the plate may be swung to any other position in the are without disturbing the relative positions of the mechanism mounted thereon. This arrangement of parts is provided to permit the same feeding mechanism to be used for feeding in different directions. Mounted in suitable 'oearings upon plate E is a shaft c, upon which between its bearings is keyed a'worm-whcci 6 adapted to mesh with worm c, and upon the end of which is a pinion Upon another shaft c also mounted in bearings carried'by plate E and keyed between the bearings, is a sprocket-wheel c and upon the end of the shaft c is a gear-wheel 0. An intermediate gear-wheel c adapted to mesh with wheels 0- and e, is carried by an arm or lever 7e, loosely secured to the shaft c. The free end of the lever 6 takes between the to receive a clamping-bolt a, taking through the arm c and by which the latter may be clamped in any desired position relatively to.

the standard. The clamping-bolt is provided with a combined nut and handle a, by which it may be speedily actuated. By releasing the bolt the arm c may be raised and the intermediate gear e disengaged. This affords a convenient and speedy means for relieving the sprocket-wheel e from strain and for adjusting the feed-chain.

For feeding or drawing the device I use a sprocket-chain I, made of steel and having hooks at the ends,with which to grab the links of other chains used as extensions. The chain is operated by beingplaced on the under side of sprocket -whecl c between the bearing standards, and is held up to the teeth by a raised part or guide c on plate E. When the full length of the chain has been used in feeding, thesprocket-wheel e is'rcleased from strain and the chain drawn back and rehooked in the extension-chain for use again.

I This relates to the lateral feed more especially, and is repeated until the kerf is completed.

I11 the operation of cutting coal or other similar substances a variation of the feed movement independent of the speed of the cutting mechanism is essential to secure the best and most economical results: This is accomplished on my machine by changing the gear-wheels e and e or substituting other" sizes for them. This is easily accomplished, since they are both on the end of their're spective shafts outside of the bearing and are loosely fitted with a feather to prevent turning. In Fig. a change of sizes and also a change of the intermediate gear is shown. The latter is not necessary, but may be done,and is provided for by mounting the intermediate gear-wheel adjustably in the arm a In the form shown the arm 6 has a slot 6 serving as a bearing for the shaft e upon which the intermediate wheel is mounted. The shaft e is screw-threaded at its ends and provided with nuts e by which it may be clamped in p 'the desired position. I

To provide for my machine a strong yet light and rigid extension or cutter-arm, I make use of the .following construction.

The frame of the cutter arm is securely fastened to the-extension O and consistsof longitudinal bars cl and o."-two on "each side superimposed and parallehbut connected by transverse bars d Along the sides of this frame and bent circularly around the forward extremity is the band or shoe d This is preferably of steel and extends backward along the sides of frame D nearly to the point of union with the extension 0. Along the side portions of shoe d at suitable intervals are drilled holes to receive the right and left hand threaded rods or bolts d. These rods or bolts are provided with square heads, and the holes in I shoe 01 are countersunk to receive them to a depth slightly greater than their thickness. They pass between the longitudinal bars 01 and d and through the spaces between the transverse bars 61 and are united by the rightand-left-threaded connectors d Through the forward transverse bar (Z is drilled and tapped a hole for the reception of an expansion-bolt d, which is provided with a round shank (1 a shoulder d a fiat-sided part (Z for convenience in'turning, and a lock-nut d Fixed centrally upon the inner: side-of the circular portion of shoe (1 to reinforce it is an expansion head or bar d. In the expansionhead cl is a hole adapted to receive shank d of expansion-bolt d. The object of thisconstruction is to provide a convenient means for adjusting the reach of cutter-arm D to the requirements of the cutter-chain and. a ready way to remove the latter without taking it apart.

' part, and m order to do this in the quickest from the shank of expansion-bolt d and least expensive manner the shoe is made removable. To remove the shoe, the bolts 01 are turned out of connectors and removed, and the shoe is drawn forward. to release it To lengthen the cutter-arm and tighten the cutter-chain, the bolts d are turned out of connectors d until loose, and expa-nsion-bolt-d? is turned out, pressing against the expansionhead (1 and forcingthe shoe (1 forward. The expansion-screw is held from displacement by lock-nut al and the shoe is clamped to the side of the frame D by tightening the con nectors (F. The bolts at, being between the side pieces d and d, have ample longitudinal movement, but are securely held vertically.

F represents the cutter-chain; f, the cutter-links; f, connecting-straps forming the sides of intermediate or connecting links; f -pintles for joining the cutter-links and the straps constituting the intermediate links; f, a shoe detachablysecured to the cutterlinks; f av cutter shankor; holder; f cutters carried thereby, and f a pin of novel construction for holding the cutter-shanks in their sockets. The cutter-link f has an elongated longitudinal opening f and transverse holes f The shoe f has a Width equal to that of the cutter-link and is provided with projections ffl adapted to take into .the. opening f in the cutter-links. -Upon the outer face of eachof these projections is formed a recess f conforming to the curve of the pintles. A segment corresponding to the recesses f is removed from the portion of the pintle which comes opposite the opening f leaving a flat face f By turning a pintle to such a position that its fiat facewill be parallel with the path of the projections f the shoe can be inserted. I prefer to rivet the pintles tightly to the connecting-straps and to arrange them with their flatfaces in substantially the position relatively to the other parts shown in Fig. 16. WVhen so arranged, the shoes will be held in place when the portion -of the chain which they occupy is straight or bent inward-that is, when in any position which they may occupy in the normal operation of the chain-but they may be released by bending the chain outward until the fiat is desirable to keep the cutting points or tools sharpand also to have them uniform in length; otherwise'those whichv are longest will do the effective. of time cutting in such substances as sulfurcoal or fire-clay, it mustbe very hard, which 39 most work and soon become dulled andin- To keep a tool sharp any length shocks and prevent breakage. dinarily used for this character of work have brought into cutting position.

' is impracticable unless su flicient m ctal is provided in the body of the tool to withstand the The tools ortheir points and shanks combined in one piece of steel, and tllB-flOqllOl'l'D forgings and grindings soon produce uneven sets and had work is the result. lll'orcovcr, the shank, which is themest expensive part of the tool, soon becomes worn out anduselcss and is thrown away, adding greatly to the cost of operating. To obviate these objections, I provide the removable cutter-shank f and the cutters f. The cutter-shank is preferably made of line steel and has at its outer 'end curved depressiensf affording seats for the cutters,which may be secured. to the shank by riveisf or in other suitable manner. The cutters are preferably provided with two or more cutting-faces f, the extremities of which are equidistant from the center of the cnttcr-blank. From these extremititzsrcarward the diameter of the blank is gradually reduced, thereby making clearance for the points when cutting. Near the edge of the depressions in which the cutters are seated the holders are provided with transverse holes through which take pins f', adapted to engage with the rear of the cuttermints and hold them against rearward movement. A cutting-face may be used until. dull, when by removing the pin another facemay be I This is continucd until all are dull, when the holder is removed and another substituted. The cutters are prcferabl y removed from the holders for grinding. For securely holding and quickly reinovii'ig the shanks or holders I proviile the pin f, adapted to take through the transverse holes f in the cutter-links and a corresponding helef in the cutter-shank. This pin has at one end a head f and carries at the other end a pendantf, having an eye of such size that when turned .in line with the pin it may be drawn through the holes f and f. The pendant is ofsuch length that when the cutter is in operation the pendant will be held by the wall of the kerf from attaining a' position in line-with the body of the pin or any position in which the pin may escape.

To facilitate moving the machine laterally across the gallery, I provide a track II and a carriage K, adapted to travel thereon and upon which the main frame is mounted. The track II preferably consists of steel bars h of the form known as channel-bars. These bars maybe joined in any suitable manner; but I prefer to use connecting-plates 7i, having a width equal to the channel of the track and extending longitudinally some distance in each section of the track. are provided with apertures adapted to take over upwardly-projectbng studs 7&2 in the track. it will be seen that it is only necessary to drop the cennccting plate overthe studs in two tracloseeticws to hold them sccurely together, theconnec ing plate by its These plates" engagement with the channel-walls holding the track against transverse strain. On the under surface of the track alid bolted or otherwise secured thereto are transverse plates h, carrying downwardl y-extendin g points or spurs h. When the weight of the apparatus is brought to bear upon any part of the track, the spurs sink into the fioer,which is usually of slate or lire-clay, and p rcvent displacement from side strain or other causes. The spurs are preferably made removable, in order that they may be removed forsharpening or to be replaced by others. The carriage K consists of two longitudinal bars 70, joined by aseries of pin tles 7.1, placed at regular intervals throughout the length of the bars and having reduced ends, against the shoulders of which the bars 7:, are riveted. Near the ends of the bars h are holes to receive axles or shaftsk Upon the ends of these axles are flanged wheels or rollers 75, so mounted that the flanges of each pair will fit snugly between the sides of the track. The carriage should extend beyond the sides of the main frame (which is mounted transversely thereon) to afford a suitable length of wheel-base and more effectually resist the radial or side strain of the apparatus on the track while in operation. The pintle's, in addition to their connecting functions, may housed in moving the main frame longitudinally upon the carriage, for a purpose to be mentioned. hereinafter.

To support and adjust the elevation of the rear part of the main frame, I employ a trailing device N. Upon the outside of the main frame are secured screw-blocks a, through which take adjusting-screws n, having reduced ends. Extending transversely of the machine are two parallel bars n between which midway of their length a wheel a is mounted upon a suitable axle. These bars of the adjusting-screw a. The hands a are preferably secured to the transverse bars a by rivets a or by some other means which will permit of a hinge movement, thus permitting either adjusting-screw to be turned independently. The lower ends of the adjusting-screws preferably terminate in points or spurs W. In making end cuts it may be advisable to support the machine by the screws without using the trailing wheel. As the rooms or galleries are driven inward from the entries, it is essential that the ribs, which are the roof-supporting partitions between the galleries, should be kcpt straightalong their sides and of uniform thickness. To accomplish this, the cutter-arm must at each extremity of a lateral out reach substantially in line with the wall of the rib, which it does not do when occupying its normal position relatively to the guiding-rail. ll accordingly provide means for swinging the main frame relatively to the carriage. Upon the sides of the main frame are studs a" and a and clips a Upon the stud a is an eccentric a .seaeeo adapted to receive a lever. In the form shown the eccentric is provided with a lever-socket a On the hub of the eccentric a is fixed the end of a connecting-strap 06 This strap has on one side a lug (1. adapted to take between the longitudinal bars of the carriage, and upon the other side a series of teeth a. On the stud a is a lock-plate (1 having on one side a recess (1, adapted to interlock. with the lug (L23, and upon the other side one or more recesses a, adapted to interlock with the teeth a en the connecting-strap. In Fig.

- 11 the connecting-strap is shown in engagement with the carriage K, the projection n being between the longitudinal bars 70 7c of the carriage and held from movement transversely to the track by the interlocking of the teeth of locking-platen. with those on strap (L22, the clip a serving to hold thefree end of the strap to the frame, It is obvious that if a bar or lever is inserted: in the socket of the eccentric and the lock-plate released by throwing the lever forward or backward a force will be exerted to move the main frame A transversely on the carriage K, since the strap, being in en gagemcnt with the carriage K, which is held by the track ll, must act upon the mainframe, which is free to move.

' If the lever on one side of the main frame is moved. and the lever on the opposite side left stationary or moved in the opposite direction, (the construction of both parts being identical,) it is clear that an angulardisplacement between the: carriage and the main frame must occur, which is the object sought for. By a reverse movement of the levers the angle is chang'ed,-and when they are brought to a corresponding position the angle made by the main frame and carriage is a right angle and is the normal position of the devicewhile in operation. By thus swinging the main frame I am able to regulate the direction of the forward feed of my machine, so that when beginning a kerf and at the end of a lateral cut the rib-line may be kept intact without hand-picking.

When the machineis being, moved from room to room, the parts of the connecting dc vice are disposed as shown in Fig. 12. This is done by first raising the lock-plate 0. then the connecting-strap, dropping the lock-plate on clip a", and then lowering the connectingstrap, so that its lug e interlocks'with the recess e on the lock-plate.

Since the longitudinal movement of the secondary frame along the main frameA will. be infrequent in practice, I have not thought it advisable to complicate the apparatus by making the return automatic, but provide instead a more simple device for that purpose, which has the further advantage of being quickly operated by hand. The constructionis as follows, referring to Fig. 3: Through the transverse bars a are holes which receive a vertical shaft a, uponwhich, between thev bars, is securely keyed a flanged wheel a On'thetop extremity of the shaft is keyed a finish of the cut, posts or screw-jacks between toothed o-r ratchet wheel a Fast to the hub of wheel a, between the flanges, is fastened one end of chain a the other end being fastened to the under side of motor-frame B by an eye-plate a. This chain has sufficient length to permit the necessary longitudinal forward movement of the secondary frame when the machine is operating. To. return the secondary frame to its first positioma suitable wrench o'r lever is fitted on ratchet-wheel e and the chain wound up, the wheelbeing deep enough between the flanges to cause the turns of chain (0 to superimpose on each 80 other, and thus increase the speed in proportion as the cutter-arm is withdrawn from the kerf. That the chains may offer some re-. sistance to the automatic forward feed of the secondary frame, to produce asteady motion, bolts c Fig. 1, are placed vertically il1:l10l8S through the transverse bars a outside and closato the rim of wheel a, whiehm'ay be used to clamp the bars a on the hub of flanged wheel a, and thus produce friction. 9o Friction-Washers are placed between the ends of the hub and the transverse bars.

' In Fig. 5 I have shown a preferred method of lockin g the motor-frame to the main frame at any desired point in its length. Clamps b are held to the motor-frame by screws b taking loosely through holes in the :clamps. At the upper ends of the clamps are slots 3), through which take'the stems of hand-screws D whose threaded ends take into the motorframe. The screw-stemsare provided with shoulders I), disposed between therclamps and the motor-frame. The lower ends of the clamps extend below and outside of the side pieces of the main frame. By turning the hand-screws outward the lower ends of the clamps are pressed against the sides of the main frame, the screws 19 acting as fulcrums.

.By turning the hand-screws inward the mo tor-frame is released. 1 1 o A matter of some importance in the operation of a machine of this eharaeter'is a secure fastening for the chain or rope'which draws it across the room or gallery. Since 4 the cut must be made close to the rib at the.

the roof and floor are not available. I have tried various devices and prefer the one shown in Figs. 21, 22, and 23. O is a screw, of rather large dimensions,having an inclined'eye. The x 20 shank or body of, the screw is cut with coarse ii-shaped threads and flattened on one side 0 5111011 510111] its length,'the eye being bent to an ang e of about forty-five degrees from the flattened surface. Pis a wedge or key adapt- 1 25 ed to be used in connection with the screw 0.

In operation a hole slightly smaller than the threads is drilled or bored in the rib at such an angle that when the screw is inserted its" eye will stand from the rib at a'right angle. 0 The screw turned in, the'sharp corners of the threads at the flattened surface cutting their way into the coal, the Wedge is then'driven in to hold it more securely. It is understood menccment and the center.

that the hole in the rib is made angular in any direction, This affords a secure holding for the chain or rope, which can be hooked to it without danger of pulling out.

I note here that each machine is provided with a truck or platform-car having wheels to lit the mine-tracks, on which it is mounted for movement about the mine.

llavingdeseribed the mechanism of-my device in detail, I will now describe the operation in general and theconnection which various parts have with each other in performing the work.

Fig. 24 illustrates a mine floor or gallery with the track laid and the machine mounted on it at two points of the cutviz. the com- R is the room; 0*, the entrance to the room; 7'', the ribs; 7*, bleak-troughs for air; 1", posts to support the roof; 7-, the face-or breast of coal to be cut, and S the entry. The machine having been-brought into thegallery is mounted on the track and carriage and moved forward until the end of the main frame nearly touches the coal. The trailing device N is then put in position an d the rear end of the main frame elevated by the screws a ct. The frame is then moved longitudinally along the carriage K to the end nearest the rib and the Whole machine moved along track II close to the rib. The main frame is thrown to an angle, as shown at the left in Fig. 24, by means of the eccentrics a and connecting-straps a. It is new read y for the first operation, which is making the forward or longitudinal cut; This is done by placing the feed mechanism in the position shown in Fig. 1 and connecting the free end of the feed-chain I to the transverse bar a" at the front end of the main frame, a hole (5 or equivalent means being provided for its attachment, The motor is then started, and the armature-shaft, acting through bevel-pinion b bevcl-wheclc, vertical shaft 0 and sprocket-wheel c drives the cutter-chain i around the cutter-bar D. The worm c is engaged with clutch c in the manncrbefore described and intermediate gearwheel e thrown into mesh with wheel e, which causes the sprocket-wheel e to revolve and, pulling on the feed-chain I, draw the motorframe longitudinally forward on the main frame A. The cutters, operatingon the coal, cut their way inward to the position shown by the dotted lines. The fecd-clutch is then thrown out of engagement with the worm and the main frame turned on the track to a right angle. The motor is then stopped, and the motor and main frames clamped together. The feed mechanism is swung upon plate E about ninety degrees and clamped in its new position. The feed-chain I is pulled through llll(l(}l' tll(} feed sprocket-wheel e and connected directly or by means of other chains with the screw-eye O, which has been inserted in the opposite rib. The motoris again started and the operation is as before, except that the feed mechanism draws the machine across the room along the track instead of longitin dinally upon the main frame and the cut is lateral instead of longitudinal. If there are posts in the room to interfere with the free operation of the machine, the rear end of-the main frame is turned up in the manner prcviously described and the motor started. This draws the device longitudinally on the track If and the cutters operating a kerf is made under the coal. At any'poin't of the cut most convenient the motor is stopped and the carriage drawn through under the main frame A to the opposite end. This is best done with a bar against the main frame on the series of pint-les 7o, placed therefor that purpose. After the machine has been drawn to the opposite rib the feed is stopped and the main frame turned on the track to bring the point of the cutter-arm in line with the rib and the cut completed, when the machine is loaded on the car to be moved to another room to repeat the operation. If at any part of the cut it is desired to inspect the cutterarm or chain, the rear end of the main frame can be lowered and the cutter-arm withdrawn for that purpose. This is accomplished by use of flanged'wheel a and chain a in the manner previously described.

It will be seen that my machine is simple .in construction and effective in o' oration, that all the parts are easily access bio, and those subjected to much wear removable.

It is obvious that the details of construction and the arrangement of the several parts will admit of modifications without departing from the spirit of my invention. I do struction set forth; but

I claim as my invention j 1. The combinationwith the main frame of a mining-machine of a track; a carriage adapted to travel thereon and carrying the main frame; eccentrics mounted on the main frame; lock-plates also mounted on the main frame,

adapted to interlock with the carriage and the lock-plates, and means for actuating the eccentric. i

2. The combination with the main frame A adapted to travel thereon and carrying the main frame, eccentrics u mounted on the main frame, loclepla-tes also mounted on the main frame, straps e having lug and teeth a adapted to interlock with cone spondin g recesses in the loek-plate,and means for actuating the eccentric, substantially as and for the purpose specified:

3. In a mining-machine, the combination of a main or supporting frame, consisting of sections provided with interlocking parts, means for locking the sections into alinement with each other, and a secondary frame, carrying and for the purpose specified.

v 4:. In a ininingmiaehine the combination of amain or supporting frame, consisting of secthe operating mechanism, substantially as not therefore limit myself to the exact conand straps carried by the eccentrics and of a mining-maehine of track H, carriage K tions hinged to each other, and provided with interlocking parts, means for locking the sections into alinement with each other, and a secondary frame carrying the operating mechanism, substantially as and for the purpose specified.

5. The combination, in a mining-machine, of a main frame, consisting of sections having interlocking parts, a bolt connecting the sections and serving as a hingepin, elongated bolt-openings in one of the sections, adapted to permit a limited sliding movement of one section relatively to the other when in aline ment, substantially "as and for the purpose specified.

6. The combination, in a mining-machine,

of a supporting-frame, a secondary frame movable thereon, a base plate pivotally mounted on the secondary frame, carrying the feeding mechanism, and means for looking the baseplate in difierent positions on the secondary frame, substantially as and for the purpose specified. I

7. The combination, in a mining-machine, of a supporting-frame, a secondary frame movable thereon, a base-plate mounted on the secondary frame, autom atic feeding mechanism carried by the base-plate, consisting of a train of gearing, a sprocket-wheel, a feedchain, and devices for connecting and disconnecting the sprocket-wheel and the drivingshaft, and provisions wherebythe base-plate and the mechanism carried thereby may be swung partially around the driving-shaft, substantially as and for the-purpose specified. 8. The combination, in a mining-machine,

of a supporting-frame, a secondary frame, movable thereon, and carrying the operating mechanism, a base-plate mounted on the secondary frame, automatic feeding mechanismcarried by the base-plate, consisting of a train of gearing, a sprocket-wheel, a feed-chain, one or more detachable gear-wheels for changing the speed of the feed-wheel, and provisions whereby the base-plate and the mechanism carried thereby maybe swung partially around the shaft which drives the feed mech thereby may be swung partially around the 6,, of the supporting-frame'A, the secondary shaft which .drives' the feed mechanism, subst'antiall y asand for the purpose specified.

10; The combination, in a mining-machine,

frame and-the be se-plate E, mounted upon the secondary frame and adapted to swing thereon, the shaft 0 worm c carried there'- by, worm-wheel 0 adapted to mesh therewith, the worm-wheel shaft 2', the lever e mounted thereon, the slot eVin said lever, the shaft e mounted thereon, the intermediate wheel 6 carried thereby, the gear-wheel e adapted to mesh therewith, the shaft 6 carrying the said wheel,-the sprocket-wheel e mounted upon said shaft, and the feed-chain I, substantially as and for the purpose specified. I

11. The combination with the main frame of a mining-machine of a supporting and adjustin g device, consisting of ad j ustin g-screws mounted in suitable blocks on the main frame, a cross-bar having at its ends seats for the lower ends of the adjusting-screws, and a wheel mounted upon an axle carried by the cross-bar, substantially as and for th p 56 Specified.

12'. The combination with the main frame of a mining-machine of a supporting and adjusting device, consisting of adj listing-screws mounted invsuitable blocks on the main frame, a cross-bar having at itsends hinged seats for the lower ends of the adjustingscrews, and a wheel mounted upon an axle carried by the cross-bar, substantially as and for the purposespecified;

13. Main frame A, screw-blocks n, adjust- I ing-screw's n, having spurs n, the transverse bars of, the bands nihaving a hinged connection with the transverse bars and servlng as seats for the adjusting-screws, and the wheel n carried by the transverse bars.

14-. The ccmbination,"in a mining-machine, of a main rame, a secondary frame adapted to travel thereon and carrying the operating mechanism, parallel bars secured to the main frame, a flanged wheel mounted upon a shaft having its bearings in the parallel bars, a ratchet-wheel mounted upon said shaft, a chain connecting the flanged wheel and the secondary frame, means for actuating the ratchet-wheel, andmeans for clamping the bars upon the hub of the flanged wheel, substantially as andfor the purpose specified.

15. The combination in a mining-machine of-the main frame A, the secondary frame'B movable thereon, the cutter extension or arm D carried thereby, the guide or shoe (i the bolts d connectors (1 extension-bolt d the cutter-carrying chain F, and means for driving the cutter-carrying chain, substantially as and for the purpose specified;

16. The combination with a mining-machine of .a cutter-chain having a series of links provided with detachable shoes, and a, series of removable cutter-holders carried thereby, substantially as and for the purpose specified.

'17. The combination with a mining-ma chine of a cutter-chain having a series of slot ted links, detachable shoes having projections adapted to take into the slots, means for securing the shoe to the link and with the 

